WYOMING STATE GEOLOGICAL SURVEY GEOLOGIC MAP OF …
WYOMING STATE GEOLOGICAL SURVEY Thomas A. Drean
Director and State Geologist Laramie, Wyoming
Geology - Interpreting the past - providing for the future
45?0'N
110?0'W
109?30'W
Yellowstone National Park
44?30'N
44?0'N
GEOLOGIC MAP OF THE BIGHORN BASIN, WYOMING
109?0'W
108?30'W
M O N TA N A
108?0'W
107?30'W
107?0'W
EXPLANATION
45?0'N
:
((
Formation contact
MAP SYMBOLS
Normal faultL >CC54F 85A53>=351;5421;;1=421A>=4>F =C8A>F =2;>3: =>45B97=1C9>= >=61D;CCA1359=4931C5BD=45C5A=
Thrust faultL >CC54F 85A53>=351;54B1F C55C8>=D?C8A>F =C53C>=931;;H89785A2;>3:
_ >D=CHB51C
U 9CH>AC>F = "1: 5>AA5B5AE>9A
(/3 0
+) 8978F 1H
!(59
) C1C58978F 1H
")59
>D=CH>A>C85AA>14
-92=>4D(=49E15AHA( 5B5AE1C9>= >D=CH2>D=41AH
) C1C52>D=41AH
44?30'N 44?0'N
CENOZOIC
GEOLOGIC UNITS (Geology enlarged from 1:500,000 scale to improve readability)
Quaternary
'Q1a ;;DE9D;;DE9D< ' QCt A1E5;?549B9CB 'Q7g ;1391;45?>B9CB 'Ql;sB "1=4B;94545?>B9CB 'QDu ) DA69391;45?>B9CBD=49665A5=C91C54
Quaternary and Tertiary
'QT*g7 *5AA1357A1E5;
Cretaceous and Jurassic
!KJ ;>E5A;H1=4#>AA9B>=>A=B !KJBs ;>E5A;H#>AA9B>=1=4) D=41=35>A=B !KJ7g ;>E5A;H#>AA9B>=) D=41=351=4H?BDA=B
Jurassic
BJs ) D=41=35>A= JBs7g ) D=41=351=4H?BDA=B
Jurassic and Triassic
Tertiary
/J^ ) D=41=351=4H?BDA=B1=4$D775C) 1=4BC>=5
*Th8rA D3: ;525AAH( 9475*D66>6. 5;;>F BC>=5A>D?
*TmA4>A=BK9=?;135BDC&51: *A138H1=45B9C5>6) D=;978CA>D?
2B1A :>1 , ;>31=93 )D 5?A7A>D?
*TCt
*5?55*A19;>A=
*Ta1
H3A>BB>A=
*TtCsB
*8>A>61A5A55: 1=4) D=;978CA>D?BK9=3;D45B*F >%351=1=4 "1=76>A4>A=B*A>DC&51: *A138H1=45B9C51=4 - 1?9C9>A=
*TsB
) D=;978CA>D?K9=3;D45B*A>DC&51: *A138H1=45B9C5- 1?9C9 >A=A5B35=C9;;1B1;C1=4#>D=C- 1;;135 >A=
*TtCp?
*A>DC&51: *A138H1=45B9C5
*TwFp?
- 1?9C9>A=
*Ta1wF
- 1B82DA=A>D?K9=3;D45B) 5?D;385A"1A=B
J/^7g3c H?BDA=$D775C) 1=4BC>=51=48D7F 1C5A >A=
Triassic
/ 3^c 8D7F 1C5A>A=>AA>D? /^3c4d 8D7F 1C5A1=49=F >>4H>A=B
MESOZOIC AND PALEOZOIC
/^&P3cg7 8D7F 1C5A1=4>>B577>A=B /^&P7g >>B577>A= #MzIP&zI #5B>I >931=4&1;5>I >93A>3: BD=49665A5=C91C54
PALEOZOIC Permian
&?Pp &8>B?8>A91>A=1=4A5;1C54A>3: B
Permian, Pennsylvanian, and Mississippian
&P#M *5=B;55?) 1=4BC>=51=4A=
Mississippian
#M="9=5>AA>D?
Mississippian and Devonian
*TwFb2 - 17>=54>A=
#MD #149B>="9=51=41A2H>A=
*TtCa1 *1CA=
Mississippian, Devonian, and Ordovician
*TwFl ; - 9;;F >>4>A= *Ti9m< =491=#514>F B>A= *Tc3rA A1=41;;>=7;>AC+=9>=>A=
MESOZOIC Cretaceous
#MDO%#149B>="9=51A2H>A*8A55>A: B5665AB>=1=451AC>>C8
DCC5>A=B1=4978>A=>;>="9=51=4978>A=>;>A: B5665AB>=1=451AC>>C8DCC5>A=B1=4978>A= >;>DBA>3: B
Ordovician
!K;l "1=35>A=
%O2b 978>A=>;>A= !KmA= !K3c >4H) 81;5 !K6f A>=C95A>A= !Kf6tC A>=C95A>A=#>F AH) 81;5#D44H) 1=4BC>=51=4
*85A?>;9B) 81;5 !KmF AH) 81;5#D44H) 1=4BC>=51=4*85A?>;9B) 81;5
Ordovician and Cambrian
%O0^ 978>A=>;>B, 5=CA5>A=1=45@D9E1;5=CB1=4 ;1C8514) 1=4BC>=5
PRECAMBRIAN
pA^u &A5313: BD=49665A5=C91C54
43?30'N
BASIN LOCATION MAP
110?0'W
Map Projection: Lambert Conformal Conic False Easting: 500000, False Northing: 200000 Central Meridian: -107.5 degrees West Standard Parallel 1: 41 degrees North Standard Parallel 2: 45 degrees North Latitude of Origin: 41 degrees North Linear Unit: Meter Horizontal Datum: North American Datum of 1983 (NAD 83) Ellipsoid: Geodetic Reference System 80
109?30'W
N
MN
#17=5C9353;9=1C9>=
J
1C35=C5A>6 ................
................
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